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DO Yoy need to Replace the lineset on a new air conditoner. It is best to replace when possible, It will make the new unit last longer. The polyolester oil in the new R410A systems will clean the old lines on the inside and can plugup the expansion device or filter dryer. Also the pressures are a lot higher on the R410A. You do not want to have any leaks in these new systems, they are more costly to repair, a major leak not repaired within minutes can result in needing to replace the equipment, where a R22 system could just be repaired and evacuated.

ruf-n-redy said: if the cu lines are in good condition, no they can be reused when going from r22 eqipment to r410a equipment, BUT they must be flushed properly, i prefer PAR FLUSH by PARKER. keep open lines sealed untill readdy to connect and weld. r410a uses POE oil, it is synthetic and has a hygronic characteristic, meaning it likes to obsorb water, moister. upon reconnecting lineset, you must evacuate systen to a minimum of 500 microns. this will remove any moister in lineset and new evaporator coil, the condensing unit shut off valves should remain in the closed position until above step has been completed and checked. system should remain at 500 microns for 5 minutes , if this is done properly , you can be assured you have a good tight system , so charge system , ck nameplate for recommended SUB-COOLING and you should be confident of a good long service life. one other comment 16SEER is only refering to its efficency rating with a matched system that will have a AHRA certification number. the main thing is making sure your existing lineset is in good physical condition and insulated, we use 1" wall thickness today and the lines are thoroughly flush and blown out with dry nitrogen, do not forget to seal ends until ready to fit and weld. best practice is to purge lines with dry nitrogen during welding lineset to cond and coli, this will keep cu oxide from forming on the insie og cu tubing

If your training an older dog most of the time the best idea would be to have a treat in your hand and holding it in the air and tell the dog to sit if it doesnt listen the first time keep on saying sit and once you move onto a different trick do the same thing but say what the trick is.

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